From nobody Mon Sep 16 18:55:09 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=openvz.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1695060441041978.2823396658963; Mon, 18 Sep 2023 11:07:21 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qiIa5-0000TO-85; Mon, 18 Sep 2023 14:02:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qiIa3-0000Qy-QZ; Mon, 18 Sep 2023 14:02:43 -0400 Received: from relay.virtuozzo.com ([130.117.225.111]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qiIa2-0003JC-AC; Mon, 18 Sep 2023 14:02:43 -0400 Received: from ch-vpn.virtuozzo.com ([130.117.225.6] helo=iris.sw.ru) by relay.virtuozzo.com with esmtp (Exim 4.96) (envelope-from ) id 1qiIV6-008crV-2T; Mon, 18 Sep 2023 20:01:01 +0200 From: "Denis V. Lunev" To: qemu-block@nongnu.org, qemu-devel@nongnu.org Cc: stefanha@redhat.com, alexander.ivanov@virtuozzo.com, mike.maslenkin@gmail.com, "Denis V. Lunev" Subject: [PATCH 19/22] parallels: naive implementation of parallels_co_pdiscard Date: Mon, 18 Sep 2023 20:00:57 +0200 Message-Id: <20230918180100.524843-21-den@openvz.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230918180100.524843-1-den@openvz.org> References: <20230918180100.524843-1-den@openvz.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=130.117.225.111; envelope-from=den@openvz.org; helo=relay.virtuozzo.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1695060443142100003 Content-Type: text/plain; charset="utf-8" * Discarding with backing stores is not supported by the format. * There is no buffering/queueing of the discard operation. * Only operations aligned to the cluster are supported. Signed-off-by: Denis V. Lunev Reviewed-by: Alexander Ivanov --- block/parallels.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/block/parallels.c b/block/parallels.c index d9d36c514b..1ef23f6669 100644 --- a/block/parallels.c +++ b/block/parallels.c @@ -537,6 +537,51 @@ parallels_co_readv(BlockDriverState *bs, int64_t secto= r_num, int nb_sectors, return ret; } =20 + +static int coroutine_fn +parallels_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) +{ + int ret =3D 0; + uint32_t cluster, count; + BDRVParallelsState *s =3D bs->opaque; + + /* + * The image does not support ZERO mark inside the BAT, which means th= at + * stale data could be exposed from the backing file. + */ + if (bs->backing) { + return -ENOTSUP; + } + + if (!QEMU_IS_ALIGNED(offset, s->cluster_size)) { + return -ENOTSUP; + } else if (!QEMU_IS_ALIGNED(bytes, s->cluster_size)) { + return -ENOTSUP; + } + + cluster =3D offset / s->cluster_size; + count =3D bytes / s->cluster_size; + + qemu_co_mutex_lock(&s->lock); + for (; count > 0; cluster++, count--) { + int64_t host_off =3D bat2sect(s, cluster) << BDRV_SECTOR_BITS; + if (host_off =3D=3D 0) { + continue; + } + + ret =3D bdrv_co_pdiscard(bs->file, host_off, s->cluster_size); + if (ret < 0) { + goto done; + } + + parallels_set_bat_entry(s, cluster, 0); + bitmap_clear(s->used_bmap, host_cluster_index(s, host_off), 1); + } +done: + qemu_co_mutex_unlock(&s->lock); + return ret; +} + static void parallels_check_unclean(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) @@ -1417,6 +1462,7 @@ static BlockDriver bdrv_parallels =3D { .bdrv_co_create =3D parallels_co_create, .bdrv_co_create_opts =3D parallels_co_create_opts, .bdrv_co_check =3D parallels_co_check, + .bdrv_co_pdiscard =3D parallels_co_pdiscard, }; =20 static void bdrv_parallels_init(void) --=20 2.34.1